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(a) Content of endotoxin and (b) the proportion of dead and alive bacteria in different types of stagnant water. Data were collected from samples 6-11 in Table 1. B: blank control, water sample free of endotoxin; C: control (sample 6), the tap water came from the residential area nearly university; L: laboratory (sample 9); T: teaching building (sample 7, 10); D: dormitory (sample 5, 8, 9). “*” indicates a significant difference between the sample and the control group (P < 0.05).
